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Lebanon police said Tuesday a man responded to a Craigslist advertisement last Wednesday in which an undercover police officer posed as a 15-year-old girl.

Police said Armstrong sent numerous emails over several days in response to the advertisement. Armstrong discussed having sexual contact with the individual he believed to be the teen, officer said.

Investigators also said Armstrong sent a picture of his genitalia over email to the person whom he believed was the teen.

On Monday, police said Armstrong asked the minor to meet at Rail Trail. Officers saw a man fitting Armstrong's description on the trail at the time he asked to meet.

Investigators determined Armstrong was there to meet the teen he believed he had been speaking to online.

Armstrong faces numerous felony charges, including obscene matter, criminal contempt and certain uses of computer services prohibited. Armstrong's charges stem from the fact that he is currently on bail for an arrest April 4 for soliciting prostitution.

Lebanon police said Armstrong advertised money for sex online in a separate incident. He was arrested April 4 for offering an undercover officer $75 for sex.